Lifting-dog



' M. F. HEALY.

' LIFTNG DOG. -APPLIcATloN FILED 1uLY19, 1919.A

PatentedSept. 14, 1920.

UNITED sTATEps PATENTv OFFICE.

` MAURICEF. HEALY, or wn'rnn'rowiv, MASSACHUSETTS.

LIFY'rING-Doe.'

Application filed .Tuly 19, 1919. v VSerial No. 312,088.L

(FILED UNDER THE Acr'r or MARGH 3,1883, 2,2 sur. L., 625.)

To all whom it may concern.'

f Be it known `that I, MAURICE F. HEALY,

y heavy bodies by inserting it. intoa cavity contact with steel or otherhard substance. f

in'` the body to be lifted, said device being heldtherein by friction orotherwise ydue to teheexpansion of its 'l 'parts within the cavity. y jThe construction of the vlifting .dog vhere shownis especially adaptedfor use in lifting lprojectiles or other heavy bodieshaving tapering orbottle-neck cavities, the outereX- tremity of which is screw threadedVor is otherwise liable to/injury if vbrought into The object is toprovideasimple, durable and inexpensive device vof the Vclass de-Vscribed in which convenient,meansy are pro videdfor theinsertionbfthedevice inits collapsed form into thecavity of thebody vtobe lifted.

inother object is to provide yccnvenient means for callapsing the partsand removal of the device from thecavityafter the lift-y ing operationhas been performed.

Another object is`to provide against any injury to the screw threads orotherdestru'ce tible surface at the entrance tothe cavity. To that end astructure is provided wherein 4 the expanding or adjustable parts comingin contact with the walls of the cavity are located entirely within thecavity and re-` mote from the entrance` thereof, thus avoiding anybreakage, chipping orother damage nearthe cavity entrance. This featureis of specialimportance in lifting stone or other fragileubodies as wellas projectiles having screw lthreads at the entranceto the cavity.

Apreferred embodiment of ythe improved arms 13,

device is shown in the accompanying draw ing in'which similar numeralsindicate corresponding parts in all the figures.

' Figure l is an elevation of the lifting dog shown in its collapsed ornon-engaging position in the end of a projectile.

Fig. 2 is a similar view with the parts expanded and in contact with theinterior walls of the projectile, or in their lifting position. u v e l.Y

F 3 is atop plan view of the vsleeve and the parts mountedthereon. j V

Referring to the drawings by numerals, the device consists of thehangeror lifting rod 10 having the cone orspreader 11 mounted at itslowerendand the sleeve or'collar 12 on which;` are mounted the jaws or Thevlifting rod 710 is preferably formed with anl eye head Mat its upperend or other suitable 'means for thereception of the ring 15, whichvringis adapted fory connection with the lifting cable ofga hoisting meansnot shown. `The lower end of the rod l0 is screw threaded at 16 toreceive nut 17, which locks the cone or spreader 11 on the rod. The rodi() may be `taken yfrom stockof the proper diameter, cut into lengths,threaded at one end and flattened and punchedat the other, when it willbe readyk for use; all of 'which maybe performed by unskilled labor.

The cone or spreader 11 is provided with the bore 18 and inclined outersurface 19, and said cone is threaded on rod 10 and is firmly held inplace by lock nut 17. The cone is, liowever,rotatably radjustable inrelation to the arms 13 which are adapted to Contact with its upperface, thus prolonging'the life ofthis part of thedevice by distributingthe wear over the entireV surface of the cone.

- The cone 11 may be castreadyfor use.

u The sleeve or collar l2, is provided with a central bore'2O in whichrod l() looselylits. The sleeve is preferably cylindrical-and of ladiameter considerably less than the dimensions of rthe cavity into whichit is to be inserted. VIn theouter face of the sleeve 12,A

are arranged a series of longitudinal dovetail grooves 21, in whichpreferably wooden strips 22 are inserted and'project'beyondthe surfaceof the sleeve to suoli an extent as to j come in contact with an outeror encircling body and prevent any contact between said outer body andthe sleeve.

Near its upper edge the sleeve is provided with radial openings 23,preferably threev in number, spaced uniformly about its periphery inwhich rods 24C have a driving lit. 'lhe rods 2l which may be stock cutto length have dual `functions, one being to provide handles whereby thedevice may be inserted into or removed from the cavity in the body to belii'ted, the other tov rest on the upper edge of the cavity and suspendthe device in the desired position within the cavity.

From the lower acevof the sleeve 12, depending ears 25 extend, andpivotally mounted on said ears are opposed arms or jaws 13.

'lhe sleeve which may be cast ready for use, as above statedv isrotatable on rod 10 and thusV prevents localization of wear on said rod,in its bore or on the outer surface oli the strips carried by thesleeve.

rl"he arlns are somewhat wider than the ears 25 and are solid throughoutwith the exception of the upper bii'urcated end, which provides wings orprojections 26 lying on opposite sides of the ears 25 and to which thearms are pivotally secured by bolts 27 passing through openings in theears 25 and wings 26. i

By mounting the arms in the manner de scribed, the normal position ofsaid arms when suspended on their vpivots 27, is hanging directly downtherefrom or in a vertical position. ris shown in Fig. 1, said arms whencallapsed are well within the outer dimensions of the sleeve and willfreely enter any opening into which the sleeve will pass.

'lhe lower endsl ol' the arms 13 which may be cast readylor use aretapered on tour surfaces. 'llhe inclined or taliiered si c is adapedlorcontact with the suiiace i9 or the cone to facilitate the spreadingor the arms. llhe outer tapered surface 29 is provided to increase thecontacting surlaces between the arms and the walls of the cavity, and,therefore, the friction between 'the parts and the lii'ting capacity ofthe device. rEhe rounded or tapered Vedges ot the arms as shown at l0are to prevent scoring the internal face of the cavity and to pevent asurface lor contact with the walls f* `:he cavity that would not be asliable to fracture as the sharp point presented if said edges were notrounded. The tapers 30 above described also present a more uniformcontact or bite between the arms and the different size cavities inwhich the device is intended for use.

Referring to Fig. 2 wherein the parts are shownin the lifting position,it is seen that the portion of the arm below the dotted the solidportion of the arms 13 'and the cone which is thereby caused to grip therod 10 and partly relieve the screw threads and diminish the vtendencyto pull the rod ont 0f the cone by stripping the threads.

The operation will be clear by reference to the parts shown in Fig 1 ofthe drawings, wherein the device is supported by the' rods 24 resting'atthe mouth oi' the cavity.

By grasping the handle or rods 24, the device is suspended in acollapsed position and may be inserted into or withdrawn from thecavity. Aiter the device has been inserted into the cavity as in Fig. 1,and lifted by the ring 15 'or rod 10, the arms 13 will be spread by cone11 as in Fig. 2 and the projectile lifted. By lifting the device by thehandles 2l or sleeve 12, the arms will be withdrawn or allowed to droplinto a vertical position below the bolts and the devicemay be readilyremoved from the cavity.

Having described vmy invention, what I claim as new and desire to secureby Letters Patent, is

1. A. lewis, including a lifting rod, a spreader on the lower end of therod,l an elongated sleeve loosely mounted on the rod and slidablelongitudinally thereof, means carried by the sleeve for suspendingthesame in the mouth ot a cavity, and armsconnected lto the lower end ofthe sleeveand actuated by the spreader to engage the wallsof 'thecavity.

2. A lewis having a lifting rod, a cone shaped spreader threaded on thelower end ol the rod and rigidly locked thereon, a sleeve looselymounted on the `rod and means for contact with the walls of the cavitysupported on the sleeve.

3. A lewis having a lifting rod,` a spreader, a sleeve having a paddedsurface loosely mounted on the rod and arms for Contact with the wallsof a cavity supported on the sleeve. 1

4. A lewis having a lifting rod, a spreader, a sleeve loosely mounted onthe rod having grooves in its outer face for the reception of protectingstrips and means for-contact with the walls of a cavity supported on thesleeve.

i 5. A lewis having a lifting rod,'a s reader, a sleeve loosely mountedon the rodI means for suspending the sleeve in a cavity and arms forcontaet with the Walls of the eavity, supported on the sleeve.

6. A lewis having a lifting rod, ra spreader,v`

a sleeve loosely mounted on the rod, lugs de-V pending from the sleeveand arms for contact with the walls of a cavity supported by said lugs.

8.y A lewis having a lifting rod, a spreader, a sleeve loosely mountedon the rod, lugs de'- pending from the sleeve and arms for contact withthe walls of a cavity pivotally connected to the lugs.

9. A lewis having a lifting rod, a spreader, a sleeve'loosely mounted onthe rod, lugs depending irom the sleeve and arms having tapered lowerends for Contact with the Walls of a cavity pivotally suspended from thelugs. A

MAURICE F. HEALY.

